Say you're an evil scientist. One day at work you discover a protein that crosses the blood-brain barrier and causes crippling migraine headaches if someone's attention drifts while driving. Despite being evil, you're a loving parent with a kid learning to drive. Like everyone else, your kid is completely addicted to their phone, and keep refreshing their feeds while driving. Your suggestions that the latest squirrel memes be enjoyed later at home are repeatedly rejected.
Then you realize: You could just sneak into your kid's room at night, anesthetize them, and bring them to your lair! One of your goons could then extract their bone marrow and use CRISPR to recode the stem-cells for an enzyme to make the migraine protein. Sure, the headache itself might distract them, but they'll probably just stop using their phone while driving. Wouldn't you be at least tempted?
This is an analogy for something about alcoholism, East Asians, Odysseus, evolution, tension between different kinds of freedoms, and an idea I thought was good but apparently isn't.
Yep, the first google result http://xn--80akpciegnlg.xn--p1ai/preparaty-dlya-kodirovaniya/disulfiram-implant/ (in Russian) says that you use an implant with 1-2g of the substance for up to 5-24 months and that "the minimum blood level of disulfiram is 20 ng/ml; ". This paper https://www.ncbi.nlm.nih.gov/books/NBK64036/ says "Mild effects may occur at blood alcohol concentrations of 5 to 10 mg/100 mL."